This designation indicates that the standard has been developed under a fair and open process designed to protect the rights and interests of every participant. 3 has been designated as an American National Standard (ANSI). The lastest release of this standard was in April 2018: UL 508A Ed. In Europe, the equivalent standards are EN 61439-2 (for switchboards) and EN 60204-1 (for industrial control panels for Machineries). While the NFPA 79 provides prescriptions for industrial machinery control panels, UL508A has a bruader scope and it is focused on the criteria in order to design the control panel. Starting from the basics of electrical safety, stated by the NEC and looking at the prescriptions stated in NFPA 79, it gives indications for the design of industrial control panels. UL 508A is the technical standard for the Industrial Control Panels in USA.
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